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Hydraulic Clutch Slave Retrofit Kit
Chevrolet Bellhousings

Hydraulic clutch release systems have gained wide acceptance in the aftermarket as a keen solution to both engine conversion and stock clutch linkage replacement scenarios.

Novak's Hydraulic Clutch Slave Retrofit has evolved into its third and best rendition, as our #HCRC. It bolts to the popular Chevrolet 90 degree style bellhousings - typically Small Block V8 & V6 and Big Block V8, I6 and Iron Duke style bellhousing flanges.

Chevy Hydraulic Clutch Release Kit

Option I - 7/8" bore

  • e.g., Jeep CJ vehicles with factory hydraulic release
  • Other types of factory or custom vehicles
Kit HCRC-78, hydraulic clutch retrofit slave system, Chevy bellhousings, 7/8" slave cylinder
Part #: HCRC-78* Item in Production
Weight: 2.94
Price: $208.00
Slave cylinder (7/8' bore) assembly, clutch arm, anchor bracket, adjustable pushrod, return spring, fastening hardware, instructions
* We're currently working on restocking this part. Please call us at 435-753-2513 for product lead time.

Option II - 3/4" bore (our most popular size)

  • e.g., Jeep CJ, XJ, YJ, TJ vehicles with factory 3/4" hydraulic master cylinders
  • Other types of factory or custom vehicles
  • Note that the Novak 3/4" slave is usually compatible with many 7/8" master cylinders, but will increase required pedal pressure and give a less precise feel
Kit HCRC-34, hydraulic clutch retrofit slave system, Chevy bellhousings, 3/4" slave cylinder
Part #: HCRC-34
Weight: 2.94
Price: $208.00
Slave cylinder (3/4" bore) assembly, clutch arm, anchor bracket, adjustable pushrod, return spring, fastening hardware, instructions

The Kit
Our #HCRC clutch kit has been engineered to bolt to most Chevrolet 90 degree style bellhousings and to work with their associated pressure plates.

All included components work as a system to insure a straightforward installation. The arm provides the proper ratio for the great majority of pressure plates and the T6 hardened and hard anodized billet aluminum slave cylinder and piston are absolutely durable, yet rebuildable or replaceable down the road, if necessary.

Available Kit Versions
Hydraulic clutch release systems are typically engineered to have a 1:1, master-to-slave ratio, where the leverage is not obtained through differential hydraulics. The force is obtained through the leverage provided by the clutch pedal and then the release arm / fork at the throwout bearing, like a conventional mechanical clutch - the method of transmitting the force is the only difference. These principles are discussed here.

As such, the installer will generally choose between our 3/4" bore version or our 7/8" bore version to best match the diameter of their master cylinder.

For your best benefit, read and understand the principles of working with hydraulic clutch release systems and determine the applicability for your vehicle.

* Note that Full Size Jeeps (Wagoneer, Cherokee, J Truck) vehicles do not accomodate conventional, firewall mounted master cylinders due to the brake booster and the electrical bulkhead connector. If converting one of these Jeeps to hydraulic clutch release, the installer will need to custom configure a master cylinder accordingly.

Bellhousing Compatibilities
The Novak #HCRC has been proven to work on big clutch & small clutch as well as big bore and small bore Chevy bellhousings. We have verified that the following GM bellhousing part numbers have the necessary block / bellhousing flange style that the #HCRC utilizes for mounting:

  • 3840383
  • 3788421
  • 3858403
  • 3899621
  • 462606
  • 460486
  • 464697
  • 6263756
  • 14010202
External hydraulic cylinder assembly

There are surely more Chevy bellhousings not yet listed, but these are the major ones. If you are not sure of applicability, send us a digital picture or two via e-mail, and we will let you know. See our contact page.

Aftermarket bellhousings such as Lakewood, McLeod and others have thus far proven compatible with this system.

Cast Iron Bellhousing Mod

Chevrolet Cast Iron Bellhousings
The classic cast iron bellhousing as found on so many Chevrolet engines from 1955 through the early seventies can be made to be compatible with this kit with two modifications:

HCR to Big Block clearance Big Block Installations

Installers with Chevy Big Blocks should be aware that the line fitting is very close to the oil filter boss and may require grinding.

Clearance for the standard diameter oil filters is sufficient without modifications.


Incompatible Bellhousings

lower side quarter view driver's side view overhead view front view rear half view clearance envelope
Clutch Housing


Hydraulic Lines & Fittings

Our slave cylinder uses a highly standard 1/4 DOT fitting. This is the female 3/8-24 threaded fitting ready for an SAE, male double-flare fitting. Most installers that have done any work with brake lines will be very familar with these, as will their local parts supplier.

For the easiest installation and the most professional look, we recommend our braided stainless steel and poly wrapped flex hose and line assembly (right). It features a flareless compression coupling that can accept the provided straight, 90 degree or 180 degree pre-bent lines. Or the installer can bend the provided straight line to best match their situation.

This line is ~3' in length.

Hydraulic line & hose assembly

Assembly, clutch line and flex hose, stainless and poly wrapped, 7/16-24 DOT 1/4 fittings
Part #: HCR8
Weight: 1.30
Price: $89.60
For use with Novak and other hydraulic clutch master to slave applications with standard 7/16-24, DOT 1/4 fittings
Hydraulic Slave Fittings


Optional Hydraulic Line Adapters for Jeeps
These useful adapter fittings (left) permit the adaptation of our #HCRC to 1991-present Jeep master cylinders that use the o-ring style fittings.

Master cylinder fitting

Hydraulic clutch release line adapter, late style, short (typ. TJ)
Part #: HCA-1
Weight: 0.50
Price: $20.02

Master cylinder fitting

Hydraulic clutch release line adapter, early style, long (typ. YJ)
Part #: HCA-2
Weight: 0.50
Price: $20.02

These fittings each feature a male 1/4" DOT threaded ends so that the installer can use or make standard hydraulic lines or hoses for the particular situation. The tip inserts into your 1991-1995 Jeep YJ (and 1991-1996 Jeep XJ) or 1997-present Jeep TJ & XJ master cylinder using the factory style o-ring and retaining pin. We recommend that you verify your particular fitting with the image and descriptions below prior to ordering.

Note that 1980-1986 CJ's and 1987-1990 YJ's master & slave cylinders already feature a female DOT fitting and do not require these adapter fittings.

A common example of hydraulic hose / line use of these adapters when installing the #HCRC kit is to buy or fabricate a line with a female DOT 1/4 fitting for the adapter/master side of the circuit. This line should then feature a male DOT 1/4 end for the slave side of the #HCRC cylinder port.


Optional Rebuild Kits
HCR series rebuild kit

Kit HCRK-34, rebuild for Novak 3/4" hydraulic slave cylinders
Part #: HCRK-34
Weight: 0.16
Price: $23.90
Contains the boot, piston, u-cup seal and compression spring
Kit HCRK-78, rebuild for Novak 7/8" hydraulic slave cylinders
Part #: HCRK-78
Weight: 0.16
Price: $23.90
Contains the boot, piston, u-cup seal and compression spring